Sensorless speed vector-controlled induction motor drives using new randomtechnique for inverter control

In the last decade, the features of random PWM techniques have been demonst rated [2]; [13-21] for v/f controlled induction motor drive system. In this paper, the advantages and special features of the newly developed random t echnique [2] for inverter control are highlighted and demonstrated by exper imental results of a sensorless vector-controlled induction motor drive sys tem [1], It will be shown that the new random inverter control technique in deed has some advantages over other irregular-sampled random techniques, in cluding easy incorporation with a vector-controlled drive system and signif icant reduction of computations, Experimental results from a DSP-based sens orless vector-controlled drive system are presented in the paper confirming the theoretical analysis, software and hardware design.